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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bc22a9fe035c00db6f0621c0c8b4411491626a57e7f6618078aec7fa2bc76c' 
  AND token = '6AgF2iYpkvOQAJzlQhPLevpgblExMa3gVn32NRDiL24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}